Furnace



(No Model.)

2 Sheets-Sheet 1.

T. WALKER & J.- P. CARTER.

. ORE ROASTING' FURNAGE.

Patented Mar. 20, 1894.

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V UNITED STATES PLACE.

PATENT 1 Ornlon.

THOMAS WALKERAND JOHN F. CARTER, OF PHILADELPHIA, PENNSYLVA- NIA,ASSIGNORS TO JOHN A. BARHAM AND JOSEPH A. VINCENT, OF SAME ORE-ROASTINGFURNACE;

SPECIFICATION forming part of Letters Patent No. 516,782, dated March20, 1894.

Application filed May 23,1895. Serial No. 475,214.. ca model.)

To all} whom it may concern:

Be 11: known that W6,'THOMAS WALKER and JOHN F. CARTER, both citizens ofthe United States, and residents of Philadelphia,Pennsylvania,haveinventedcertainImprovements in Ore-Roasting Furnaces,of which the following is a specification. i

. The object of our invention is to so construct an ore roasting furnacethat the ore IO will be traversed through the several retorts,

and will be transferred from one retort to another, without passingthrough the fumes. This object we attain in the followingmanner,reference being had to the accompanying drawings, in which 2O sectionalview of a portion of the apparatus,

showing the arrangementof fines for the products of combustion. Fig. 4,is an enlarged view showing the passageforming communication between theretorts, Fig. 5, is a View illustrating the mechanism for operating thevalve in said passage shown in Fig. 4; and Fig. 6, is a sectional viewshowing the blade that we prefer to use for feeding the material to theretort.

As shown in Fig. 1, we construct the furnace with a series ofindependent furnaces A, arranged in steps so that the retort B willdischarge directly into the retort below it. Each furnace has a grate a,and ash pita, and the retorts are so mounted in the walls of the furnaces, that they can be removed for repairs.

The communicating passages E in the walls of the furnaces, are formed incastings which are mounted in the wall but they may be 4 formed directlyin the brick work, without departing from our invention. The combustionchamber is divided by longitudinal partitions, so that the products ofcombustion will pass under each retort in one direction,

and return over the retort, and, in the present instance, we have showna series of pipes A extending from the upper portion of one combustionchamber to the ash-pit of the next above, and so on throughout theentire fur- 5o nace, so that the fuel will be consumed, and

we provide a stack at the upper end to carry off any smoke which may beproduced in the furnaces. We also provide stacks A for each furnace,'sothat when it is wished to operate the furnaces independently, the valvesa in the pipe may be turned so as to close the Mounted in each retort isa shaft passage. F having blades f, preferably of the construction shownin- Fig. 6, there being two sets of blades to each shaft, and each sethas a head f which is secured to the opposite head and to the shaft bybolts f If it is necessary to repair one set of blades, the structurecan be readily removed, and a new set placed in position. The bladeskeep the ore under treatment, in motion, and feed it slowly forwardthrough the retort. We prefer to use hollow shafts-and connect the endsof the shafts with a water pipe, so that there will be a constant flowof water through the shafts thus keeping them cool. The shafts arevibrated by suitable crank or eccentric mechanism, through an arm f 7The space under the combustion chamber of each furnace is sufficient toallow the driving mechanism to have free movement, and topermitinspection when necessary. A fume fine 13 is situated at thedischarge end of each retort, so as to carry off the fumes, and in thecap F of each retort is a valved opening ito admit air into the retort.

We preferably arrange the retorts in two sets, side by side, as shown inFig. 2, and use a single hopper b, a feed screw b, carrying the ore tothe inlet opening 12 of the upper retorts.

In the passage E which communicates with the discharge end of one retortand the inlet end of another, is a valve e, (Fig. 4) which is mounted ona rod 6 (Fig. 5), on which is a lever 6 acted upon by an arm f on theshaft F, so that at each vibration of the shaft, the arm f will depressthe lever e and move the valve e, so as to allow the materialto flowthrough the passage E into the retort below. The object of thisarrangement is to prevent the fumes from escaping through the passage E,the fumes in this instance will move in thereforebe seen by thearrangement of the retorts shown in Fig. 1, that the ore is fed into theupper retorts, and is moved through these retorts and discharged intothe passage E upon the valve e, and at each vibration of the shaft isdischarged by the said valve to the inlet end of the retort below it,and is carried through this retort and discharged in the retort belowuntil it reaches the outlet opening b where it is discharged from thefurnace.

By having independent combustion chambers the temperature of each retortcan be regulated, as desired.

We claim as our invention 1. The combination in an ore roasting furnace,of the series of furnaces arranged one above another in sets, a retortin each furnace, passages forming communication between the retorts,feeding mechanism in the retorts by which the material is carried fromthe receiving to the discharge end of the retort and discharged into thepassage with an automatic valve in the passage, substantially asdescribed.

2. The combination of a series of furnaces, arranged in steps one aboveanother, a retort in each furnace, valved connecting passages betweenthe retorts, outlet stacks at the discharge end of each retort to carryoff the fumes, and mechanism for feeding the ore through the retort,substantially as described.

3. The combination in an ore roasting furnade of the series of furnaces,arranged one above another in steps, a retort in each furnace, passagescommunicating with the discharge end of one retort and the inlet end ofeach furnace, one or more passages forming the retort below it, a valvein said passage fume outlet for each retort, feeding mocha ism forfeeding the ore through the retorts, and mechanism for intermittentlyactuating the valve so as to discharge the ore under treatment atintervals, substantially as described.

4. The combination of a series of furnaces arranged in steps, retorts ineach furnace, with tubes or flues extending from the combustion chamberof one furnace to the ash pit of the furnace above, and an outlet forthe products of combustion, communicating with 50 the upper combustionchambers, substantially as described.

5. The combination of the furnaces arranged in steps one above another,retorts in 55 communication between the i'etorts, ashaft in each retort,blades on said shaft, mechanism for vibrating said "shaft, a valve inthe com municatin g passage, a lever on said valve, and an arm on theshaft actuating the lever, substantially as set forth.

In testimony whereof we have signed our names to this specification inthe presence of two subsc-ribin g witnesses.

THOMAS WALKER. JOHN F. CARTER.

WVitnesses to the signature of Thomas Walker:

HENRY J UNKIN, R. CAMPION. Witnesses to the signature of John F. Garter:

.TosEPH I-I. KLEIN, HENRY HOWSON.

